80
Set carrier frequency
Table 4- 11
Carrier
waveform
Frequency
72-14120
72-14122
72-14126
Sine wave
1μHz~ 80MHz
1μHz ~ 120MHz
1μHz ~ 160MHz
To set carrier frequency, use the multi-functional control and direction keys or press soft key Freq, input the required value
and select the unit after selecting carrier waveform.
Set modulation mode
Modulation mode is a subsection of constellation, which varies with the modulation mode selected. Press soft function key
Map to highlight it, and input the required period value through the numeric keyboard or direction key and control, which
can be 4QAM, 8QAM, 16QAM, 32QAM, 64QAM, 128QAM or 256QAM.
Comprehensive example
First set the instrument to run in QAM mode, and then set an internal sine wave of 2kHz and 2Vpp as carrier signal. Set
rate to be 100Hz and modulation mode to be 64QAM. The specific steps are as follows:
1)
QAM function
Press MOD, Type and QAM in sequence (press soft key Type to select) to use QAM function.
Figure 4- 93 Select QAM function
2)
Set carrier signal parameters
Press Sine to select carrier signal as a sine wave if previously set to another mode (Default carrier signal is a sine wave).
You can set with the multi-functional control and direction keys. You can also press the corresponding soft keys of function
again, when the interface below will display. To set the parameters, press the corresponding soft key, input the required
value and select the unit.
